A cobpqration



Patented Jan, E,

UNITED stares earner JHN SCHAB, OF COLUMBUS, GEIQ, ASSIGYNGR TO THE NEW FAVORITE MANU- FACTURING COMPANY, OPT QCLUYBTLTS, (EH10, A CGRPORATION OF ORIG.

vanvn ssnnvnnn.

Application filed March 23, 1921. Serial No. 454,606.

T0 ZZ wia-0m t may concern.'

Be it known that Jenn W. Sci-inn, a'citizen of the United States, residing at Columbus, in the county of Franklin and lState of Ohio, has 'invented certain new and useful Improvements in Valve Grinders, of Which the following is a specification.

This invention relates to an improved valve grinder, and has for its object to provide a hand operated grinder wherein the valve oscillating stem is rotatably journaled `in connection Within a housing or casing', and is provided with lixedpinions capable of meshing With a hand rotated gear element the latter being of such effective sise that the teeth thereof Will alternately engage with said pinions, in order that the stem may be oscillated first in one direction and then in the other, the ratio of the teeth of the pinions and gear yelement being such y that said stem will be caused to rotate more than a complete turn or revolution from 'any given starting point, a feature Whichniaterially assists in enabling the grinder to smoothlyiinish a valve seatandto eliminate ridges or deposits therefrom.

One of the salient objects ot the present invention resides in the provision of a sprinp1 pressed shoe, which is mounted Within the casing and is disposed to frictionally contact with the valve operatingstem at a position between the fixed pinions carried by the stein, the purpose of this constructicn being i to hold the stem substantially against `rotation during the period of repose which eX- ists therein when the gear element is out ot' mesh with the pinionvs, a feature in construction Which serves to arrest undue rotation on the part of the stem, and to maintain said pinion substantially'stationary, dur- .ingjr said periodof repose. by overvolnine` the momentum of the stemn thereby enabling the teeth of the gear element to properly and readily inesh fith the teeth of the pinions with an entire absence of undue friction or gear locking movement, the construction thus servi ng; to enable the grin der to be smoothly, conveniently and uniformly operated and with an entire' absence of an intermittent, jerky or sudden uneven movements.

A further important object ofthe inven tion resides in positioning the shoe structure between the pinions and around the stem and in connecting: the shoe structure substantially to the casing, in order that the valve grinder convenient and ends of the shoe structure Will engage with said pinionsto prevent undue longitudinal movement on the part of the stem and to thus maintain the pinions properly in positions to freely and. accurately mesh with the teeth of the gear element. Y A still further object of the'invention resides in the provision of an end thrust bear-` ing for the stem, which serves to minimize friction and to render the operation of the facile in manipulation. i y

This invention constitutes a continuation of the invention disclosed in my copending application, filed March 19, 1920, Serial Number 367,139, and the present invention is particularly directed to the mechanism disclosed in said application for nfiaintaining` thevalve stem substantially stationary when the gear element is out of mesh With the stem carried pinions. j i

Other objects of the invention will be in j part obvious and in part pointed Outhereinafter.

The invention accordingly consists` in the novel :features of construction, combinations of elements and arrangements of parts, hereinafter to be fullydescribed and to have the scope thereof pointed. out `inthe appended claims. i

ln the accompanying` drawing, forming a part of this specification, and in which similar characters of reference denote like and correspondingparts throughout the sev eral views thereof:

Figure l is a vertical sectional vievv taken through a valve grinder constructed in accordance with the principles of the invention.

Figure@ is a vertical sectional View taken on a .plano substantially at right angles to that of the section disclosed in Figure l, and

Figure f3 'is a perspective .view of the shoe member. j,

Referring more particularly to the dravv` ing, the numeral l designates the valve grinder comprising the present invention in its entirety. This `grinder consists of a housing or casing 2, which is preferably of metallic construction and is formed to embody a hollow cup shaped main section 3, and a complemental andy similarly formed lower section 4. The sections 3 and 1 iare in this instance united by the threaded joint 5, in order that by the separation of'the'sections,

interior parte may be rendered readily accessible and to facilitate the initial assembling olf the grinder. The upper portion ot the main section 3 terminates in an integral knob t5, Which is ot such torni as to permit the grinder to be readily adapted tothe contormation of the hand, or in other words to be conveniently and naturally grasped and held in an operative position by the hand ot the operator. lt will be apparent that the spherical 'formation of the housing 2 as a Whole is ot considerable assistance in enabling the grinder to be easily and conveniently manipulated during operation.

Vertically journaled Within the housing is the rotatable valve operatingv stem 7 ot the `grinder. This stem is so positioned that its upper end Will be maintained in engagement with a spherical end thrust bearing e, informed in the head or top olf the housing. lt is vJell known that in the opcrat'irm olf the valve grinder, considerable Weight imposed on the same inl order that the operation ot nishing or grinding a valve seat may be properly, expeditiously and uniformly carried out yby the lWeight imposed. The iinposition of this Weight has frequently resulted in past structures in placing such stress upon the stemy and its bearings, that' the operation oli the grinder as awhole has been rendered difiicult and vawkward Aby reason of the friction betweenl movable p s. Therefore, in the present grinder the bearing 8 is provided at the upper end ot the stem 7 in order to minimize the Jfriction Which re sults in the placing of pressure upon the grinder When the latter is employed. The relationship between the bearing 8 and the upper end of the stem may be adjusted by the provision ot a. threaded screiv f) which is threaded in' the bore 10 provided in the knob o, and a locl nut ll iscarried by the ripper end of the screw 9 it'or holding` the lat-ter in adjusted positions. Obviously, by his construction free rotation on the part ot the stem may be easily effected. Thel lower section 4l in the present'grinder is provided with a central openinglQ, whichr receives the stem 7 and acts as a bearing; therefor, this bearingin combination With the bemin@v provided at the upper end ot the stem, se i to retain the latter in a -vWell supported yet freely rotatable manner within the housinaf 2.

Fixed to the stein 7 isa pair oi' opposed beveled pinions t3 and lll, which are pinned lo the steni as at l5, in order telic-rotatable in unison withv said stem'. Adapted to mesh with theteeth of? these pinions in alternate manner is a gear element 16', which is pinned or otherwise secured for rotation with a horizontally extending operating` shaft 17, the latter beingjournaled for rotation Within a relatively extended bearing 1S prorided'in"the mainsection 3. The outer l l1 n sale. stein.

end ot this shailt 17 is equipped with a manipulating crank arm if), to the outer end o'tl which is suitably connected a hand knob 20, Which may be conveniently grasped to effect the manual rotation ot the shatt 17 and its associated gear element 16. lt will be observed that the gear element is provided With tec-th which occupy a trifle less than one-halt ot the circumference ot the gear element, and hence the teeth o said element will alternately mesh, Where the shaft 17 is rotated in a given direction, with the teeth of the pinions 13 and 14:. This arrangement has been disclosed in my aforesaid application, and has been found to be advantageous in eliectingback and forth rotary movement on the part ot the stein 7. lt will be observed that the number ot teeth in' the pinions 13 and le are exactly the same and are Vadapted to mesh with the same portions ot the teeth on the gear element 1G, yconsequently the rotation ot the stem will not be rotatably progressive, but that said stem', on the contrary, will be restored after` each complete cycle et movement to its ini-tial starting point. However, in order to' preventridges or unevenness' trom presenting itself Within the seat finished by the grinder, the ratio ot teeth betweenl the gear element and the pinions is such that tor each complete revolution of the gearelement 16, the stem 7 ivill rotate a -distance slightly in excess ot a` ttull revolution, however, it the `grinder is held stationary, the stem Will be restored to its initial starting position after cach complete revolution of the crank arm.

Formed .in the casing- Q'is an inwardly extending' boss 2l, in which is' provided a bore 22. the latter being` located inhorizontal aligrnxent with the bearing 1S, so as to be conveniently produced and to be accurately located for reasons to be herein' atter set forth. Slidably received `Within the bore 2:2 is a shoe member 23, which yconstitutes-one ot the important elements ot the present invention. This shoe member is formed to include a vertically'extending, substantially semi-circular curved portion 241e, which is adapted to trictionally engage the stem 7 and toh'e ot such length `that Y.

the ends thcreoi will sul'istantiallyV contact with yhe hubs ot the pinions 'lil and 14.

Also, the shoe member is prmvided with 4a horiffontallj,y extendingl projection QF. which is slidably receive-fl within the bore Q2 and 'is disposed to engage with one end olf coilV Si niii 5r 26 disposed Within said bore, said spring' engaging' with the end ot he bore and with the inner end ot the projection so as to .torce they shoe structure as a Whole vtoward the stem 7 and particularly to maintain `lrictional Contact between the curved portion 24 ot vthe shoemember and By this construction, it Will be manifest that when the vteeth ot'th'e gear element are out of mesh with the teeth oit the pinions .l5-. and lil, the shoe member, by ifrictionally engaging the stem, will serve substantially to arrest rot-ation on the part of the stem, or in other Words to effect what may be termed an instantaneous pause in the rotation oi' the stem. This period of repose 0n the part of the stem is of decided advantage' as regards smoothness of operation, since it results in bringing the pinions to rest, thus enabling` the teeth of the gear element to easily, positively andaccurately mesh With said pinions, and with the total absence of binding or locking, which has been heretofore present When vthe shoe structure has been omitted. Moreover, the shoe member serves in another important capacity, namely, by reason of the length of the portion 2st thereof, which engages ith both of the pinions 13 and lt, vertical movement oit an undue nature on the part of said stem will be precluded, with the result that the pinions will always be capable of accurately registering with the gear element 16. Also, the construction serves to avoid eX- cessive adjustments ol.E the screw 9.

From the foregoing description taken in conjunction with the accompanying draw-l ing, it Will be manifest that an eliieient and reliable grinder is provided, and one fully capable of carrying out the objects and ad- UOl vantages of the invention. As usual, in devices of'this character, the lower end of -the stem` 7 is bifurcated to receive a valve engaging member 27, and the latter being provided With the usual. projections 28, which are designed to be placedin openings formed in engine valves for the purpose ot rotating the latter' in. unison with the stem By the provision ot the features above described, a valve grinderis provided which is characterized by smoothness in op? eration, and by the ease and facility With which it may be manually manipulated.. While the foregoing description specifically sets forth what is now believed to be the best mode of applying the principles of the invention, yet it should be understood that said description does not necessarily measure the invention. except in such manner as the latter is defined by the 'following claims.

llf'hat is claimed. is:

l, ln a valve grinder, a housing, a stem rotatably journaled in connection with said housingI` means for rotating said stem in a back and. forthnianner, comprising a pair ot spaced pinions fixed to said stem, a ro tatable gear element positioned Within said housing and arranged for alternate engagement `with said pinions, and a resilient shoe slidably supported of the housing and disposed in rictional contact With said stem` and operating to arrest movement on the part of the stem when said gear element is out of engagement with said pinions.

2. ln a valve grinder, a housing, a stein rotatably journaled in connection with said housing, means for rotating said stem in a back and forth manner, coniprisingl av pair oi: spaced pinions lined in opposed relationship to said stem, a rotatable gear element ca-v pable When revolving in a given direction oit alternately engaging said pinions, and a.

spring pressed shoe disposed in engagement with said stem between said pinions'to bring said stem to state olf repsose when said gear element is out on engagement with said pinions.

3. .ln -a valve grinder, a housing, a stein rotatably journaled in connection with said housing, a pair of opposed pinions located Within said housing and fixed to said stem, a gear element capable when rotating in a given directioirof alternately meshing With said pinions to rotate said shaft back and forth, an operating shaft tor said gea-r element, a bearing provided in said housing for the reception of said shaft, a boss formed internally of said housing and having a bore formed therein situated in horizontal alignment with. said bearing, and a resilient shoe structure slidably supported in the bore provided in said boss andv capable 'of gtrictionally. engaging said stem.

4t. In a valve grinder, ahousing, composed of a relatively hollow cup shaped main section and a removable lower section, a stem rotatably journaled in connection With bearings provided in said sections, a pair ot Xed pinions carried by said stem and situated vvithin said housing, a gear element capable when rotated in one direction of alternately engaging with said pinions to rotate said stem back and forth, an operating shaft for said gear element, a bearing provided in said main section for the reception of said shaft, a boss integrally formed With said main section and having a bore provided therein disposed in horizontal align ment with said sha-ft bearing, and a resilient shoe structure slidably received Within said bore and capable of `frictionally engaging With said stem.

5. In a valve grinder, a housing, a stem rotatablyjournaled in connection with said. housing, pair oit pinions lined to said stem and located Within said housing, a gear elenient capable oi alternately mesl'iing` with said pinions, and means carried by said. housing internally of the latter and independently ot said stem, said means being disposed between said pinions and engaged with their opposed ends to limit longitudinal movement on the part of said stem.

G. In a valve grinder, a housing, a stem rotatably iournaled in bearings provided by said housing, opposed pinions lixed to said stem and located internally oi? said housing, a gear element capable of alternately ing with said pinions to rotate said stern in beck und forth directions, and a spring pressed member slidably siipported by tlre housing` for loosely engaging said stem and situated to contact with the adjacent ends of said pinions to limit vertical longitlulinel movement on the part ot seid stem.

7. In e valve grinuen a housing` a stem rotatably journaled within seid housing, pinions fixed to seid` stem :1nd located in opposed relationship, means alternately ongeging With seid pinions to rotate said stem back and forth u shoe having` e lateral projection ai' tinged to be slidzibly received Within :L bore provided in said housing7 a spring` situated to engage seid lateral projection and to torce said shoe into frictional Contact Wit-h said stem, and said shoe beingextended so as to be capable of engaging' with the ndjacent ends oil? said pinions to limit the cX- tent otv longitudinal movement of seid stem with respect to said housing,y und to maintuinv said pinions in enge/gement with seid means.

8. in e valve grindeign housing n valve stem rotatably journaled nfithin seid housing, un adjustable thrust bearing carried by the upper portion of said housing for engagement with the upper end of said stem, pinions iixed to said stem, L rotatable geur element cape-ble ot alternately meshingivith the teeth of seid pinions to oscillute Seid stein, and a resilient shoe structure disposed to engage With seid stem `and situated be-' tween said pinions so :is to engage with the adje-cent ends of the latter, whereby the edjustment provided by said end thrust bearing` will be reguleted-- In testimony whereof l affix my Signature'.

JOHN ll?. SCHAB. 

